persistence.xml配置文件：
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1"
xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="JPA-1" transaction-type="RESOURCE_LOCAL">
<!--配置什么ORM产品作为JPA的实现 -->
<provider> org.hibernate.ejb.HibernatePersistence</provider>
<!--持久化信息 -->
<class>com.test.model.Custerm</class>
<properties>
<!--连接数据库的基本信息 -->
<property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />
<property name="javax.persistence.jdbc.url" value="jdbc:mysql:///jpa" />
<property name="javax.persistence.jdbc.user" value="root" />
<property name="javax.persistence.jdbc.password" value="root" />
<!--配置JPA信息 实际是Hibernate信息 -->
<property name="hinernate.format_sql" value="true" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.hbm2ddl.auto" value="update" />
</properties>
</persistence-unit>
</persistence>
Custerm.java
package com.test.model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Table(name="JPA_CUSTERM")
@Entity
public class Custerm {
private Integer id;
private String name;
private int age;
@Column(name="ID")
@GeneratedValue(strategy=GenerationType.AUTO)
@Id
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getAge() {
return age;
}
public void setAge(int age) {
this.age = age;
}
}
Main.java
package com.test.test;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
import com.test.model.Custerm;
public class Main {
public static void main(String[] arg){
//1.获取Jpa单元的名称
String persistenceUnitName="JPA-1";
//2.创建EntityManagerfactory
EntityManagerFactory emf=Persistence.createEntityManagerFactory(persistenceUnitName);
//3创建EntityManager
EntityManager em=emf.createEntityManager();
//4.开启事务
EntityTransaction entityTransaction =em.getTransaction();
entityTransaction.begin();
//5.进行持久化操作
Custerm cs=new Custerm();
cs.setAge(12);
cs.setName("IT1");
//6.进行保存
em.persist(cs);
//7.提交事务
entityTransaction.commit();
//8.关闭EntityManager
em.close();
//9.关闭EntityManagerFactory
emf.close();
}
}
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